Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa), which is equivalent to 1,013.25 millibars, [1] 760 mm Hg, 29.9212 inches Hg, or 14.696 psi. [2]

2024年12月21日 · Atmospheric pressure is the force per unit area exerted by a body of air above a specified area (called an atmospheric column). It is expressed in several different systems of units, including millimeters (or inches) of mercury, pounds per square inch (psi), millibars (mb), or standard atmospheres.

2023年12月18日 · The most basic change in pressure is the twice daily rise and fall due to the heat from the sun. Each day, the pressure is at its lowest around 4 a.m./p.m., and at its highest around 10 a.m./p.m. The magnitude of the daily cycle is greatest near the equator, decreasing toward the poles.

2023年10月19日 · An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). One atmosphere is 1,013 millibars , or 760 millimeters (29.92 inches) of mercury.

When gravity acts on the air, the air exerts a force upon the earth called pressure. The typical pressure at sea level is 1013.25 millibars or 14.7 pounds per square inch. A millibar is a unit that is used to report the atmospheric pressure.

CHAPTER 2. ATMOSPHERIC PRESSURE 2.1 MEASURING ATMOSPHERIC PRESSURE The atmospheric pressure is the weight exerted by the overhead atmosphere on a unit area of surface. It can be measured with a mercury barometer, consisting of a long glass tube full of mercury inverted over a pool of mercury: Figure 2-1 Mercury barometer

The atmospheric pressure is greatest at the bottom of the atmosphere. This is also where the air has its greatest density. Pressure and density decrease with height in the atmosphere. The earth's gravitational field pulls the mass of the atmosphere towards the earth's surface.

2024年12月27日 · We all know that the Earth’s surface is surrounded by a thick layer of air. This air is attracted towards the ground by Earth’s gravity, a process that creates atmospheric pressure. However, Earth’s gravity decreases with increasing altitude, so atmospheric pressure also decreases with height, forming different layers of the atmosphere.

2024年10月4日 · Atmospheric Pressure is the force exerted by the weight of these gas molecules on a unit of area on the earth’s surface. The pressure exerted by the atmosphere is about 14.7 pounds per square inch on the earth’s surface. Atmospheric pressure is highest at sea level and decreases as you go higher.

2024年2月15日 · Atmospheric pressure, also known as barometric pressure, is the force exerted by the weight of the atmosphere on a given area of the Earth’s surface. Think of it like a vast, invisible ocean of air above us.